Implantação do pinhão-manso em solo degradado inoculado e acrescido de macrófita, cinza e hidrogel

Pós-graduação em Agronomia - FEIS

Effects of potassium application and soil moisture on the growth of Corymbia citriodora plants

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Componentes de produção e morfologia de raízes de mandioca sob diferentes preparos do solo

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Efeito da adubação potássica e da época de colheita na produtividade de canola

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Seletividade do herbicida saflufenacil aplicado em pós-emergência em dez variedades de cana-de-açúcar na condição de soca

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Produtividade de cana-de-açúcar sob adubação com torta de filtro enriquecida com fosfato solúvel

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Effects of litter manipulation in a tropical Eucalyptus plantation on leaching of mineral nutrients, dissolved organic nitrogen and dissolved organic carbon

Although many studies have shown that soil solution chemistry can be a reliable indicator of biogeochemical cycling in forest ecosystems, the effects of litter manipulations on the fluxes of dissolved elements in gravitational soil solutions have rarely been investigated. We estimated the fluxes of NH4-N, NO3-N, K, Ca, Mg, Na, Cl, dissolved organic nitrogen (DON) and dissolved organic carbon (DOC) over the first two years after re-planting Eucalyptus trees in the coastal area of Congo. Two treatments were replicated in two blocks after clear-cutting 7-year-old stands: in treatment R, all the litter above the mineral soil was removed before planting, and in a double slash (DS) treatment, the amount of harvest residues was doubled. The soil solutions were sampled down to a depth of 4 m and the water fluxes were estimated using the Hydrus 1D model parameterized from soil moisture measurements in 4 plots. Isotopic and spectroscopic analytical techniques were used to assess the changes in dissolved organic matter (DOM) properties throughout the transfer in the soil. The first year after planting, the fluxes of NH4-N, K, Ca, Mg, Na, Cl and DOC in the topsoil of the DS treatment were 2-5 times higher than in R, which showed that litter was a major source of dissolved nutrients. Nutrient fluxes in gravitational solutions decreased sharply in the second year after planting, irrespective of the soil depth, as a result of intense nutrient uptake by Eucalyptus trees. Losses of dissolved nutrients were noticeably low in these Eucalyptus plantations despite a low cation exchange capacity, a coarse soil texture and large amounts of harvest residues left on-site at the clear cut in the DS treatment. All together, these results clarified the strong effect of litter manipulation observed on eucalypt growth in Congolese sandy soils. DOM fluxes, as well as changes in delta C-13, C:N and aromaticity of DOM throughout the soil profile showed that the organic compounds produced in the litter layer were mainly consumed by microorganisms or retained in the topsoil. Below a depth of 15 cm, most of the DOC and the DON originated from the first 2 cm of the soil and the exchanges between soil solutions and soil organic matter were low. (C) 2014 Elsevier B.V. All rights reserved.

Concentrações de nitrogênio e potássio na solução nutritiva do pimentão cultivado em substrato sem drenagem

Pós-graduação em Agronomia (Produção Vegetal) - FCAV

Estado nutricional e avaliação de caracteres secundários da produção em dois clones jovens de seringueira em São José do Rio Preto, SP

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Arranjo espacial de plantas na cultura do pinhão manso em Selvíria (MS)

Pós-graduação em Agronomia - FEIS

Fontes e doses de fósforo na presença e ausência de composto orgânico no estado nutricional e na produtividade da cana-de-açúcar

Pós-graduação em Agronomia (Ciência do Solo) - FCAV

Variação genética e desempenho de progênies de Pinus caribaea var. hondurensis para produção de madeira e resina

Pós-graduação em Agronomia - FEIS

Seleção fenotípica e identificação de snps em regiões genômicas ligados a resistência à ferrugem em Eucalyptus grandis

Pós-graduação em Agronomia (Proteção de Plantas) - FCA

Caracterização físico-química da biomassa produzida em sistemas florestais de curta rotação para geração de energia

Pós-graduação em Agronomia (Energia na Agricultura) - FCA

Características agronômicas, bromatológicas e econômicas de alturas de corte para ensilagem da cultura do milho

The aim was to evaluate agronomic, bromatologic and economical characteristics harvest heights for ensiling of corn. The trial was conducted in randomized block design and treatments corresponded to harvest heights of 20; 50; 80 and 110 cm from the soil surface. The agronomic evaluations were conducted 114 days after planting. The percentage of dry matter (DM) and productivity of stem, grain and participation of potassium remaining in the stem increased linearly with increasing cutting height (p<0.05). Therefore, the mass used at ensiling decreased proportionally with increasing cutting height (p<0.05). The silage quality was improved because of the increase in the cutting height. We observed higher crude protein (CP) content and energetic value in the silage harvested at 110 cm from the soil surface, while there was lower fiber content. However, silages produced with plants harvested at 110 cm from the soil surface showed the highest production cost (4.47 times greater than cycling through K in the remainder of the stem). The agronomic and bromatologic characteristics of corn silage improves with increasing cutting height, but the increase cutting height unfeasible economically the practice silage when the generation of final products is not computed. Thus, it is recommended that the cutting height of the corn plant is at most 50 cm.